Material Selection & Processing Technology of Fasteners for New Energy Vehicles

Compared with traditional fuel vehicles, new energy vehicles put forward strict requirements on fasteners for battery packs, motors and chassis, including light weight, high strength, electrolyte corrosion resistance and high precision. Ordinary carbon steel fasteners cannot meet long-term vehicle working conditions.

1. Material Standards for EV Fasteners

1. Battery Pack Fasteners

Materials: 316 stainless steel, titanium alloy, 7075 aluminum alloy

Features: Anti-electrolyte corrosion, lightweight and insulation, with passivation or anodizing surface finish.

2. Chassis High-Strength Bolts

Material: 4340 alloy steel

Features: High tensile and fatigue resistance, cadmium plating for long salt spray resistance.

3. Tiny Fasteners for Motors & ECUs

Materials: 304 stainless steel, copper alloy

Features: Burr-free, clean surface to avoid short circuit risk.

4. Lightweight Body Connectors

Materials: Titanium alloy, aviation aluminum

Features: Reduce vehicle weight while maintaining structural strength.

2. Key Processing Challenges

- Thin-wall lightweight parts are easy to deform during cutting;

- Strict tolerance within ±0.005mm for battery components;

- Ultrasonic dust-free cleaning to remove oil and tiny burrs;

- Controlled coating thickness for long-term acid & alkali resistance.

3. Common Anti-Corrosion & Insulation Treatments

1. Hard anodizing for aluminum parts, insulation and wear resistance;

2. Stainless steel passivation against electrolyte corrosion;

3. Hydrogen-free cadmium plating for high-strength structural steel;

4. Titanium anodizing for long-term lightweight protection.

With 20 years of manufacturing experience, Fanhang Hardware produces customized non-standard fasteners for EV battery packs, chassis and motors, supporting prototype sampling and mass production with full quality inspection.